Selected Quarterly Financial Data (Tables)

12 Months Ended

Dec. 31, 2012

Selected Quarterly Financial Information [Abstract]

Schedule Of Quarterly Financial Information [Table Text Block]

			Quarter Ended
			March 31		June 30		Sept. 30		Dec. 31 (i)
Fiscal 2012
	Net sales	$	144,663	$	159,239	$	166,617	$	163,287
	Gross profit		33,706		41,028		43,605		43,247
	Net income attributable to common shareholders		4,871		6,653		8,553		4,075
	Earnings per share attributable to common shareholders
	Basic	$	0.11	$	0.15	$	0.19	$	0.09
	Diluted		0.10		0.14		0.18		0.09
			Quarter Ended
			March 31		June 30		Sept. 30		Dec. 31
Fiscal 2011
	Net sales	$	161,555	$	169,806	$	160,577	$	143,313
	Gross profit		57,393		55,615		45,194		35,495
	Net income attributable to common shareholders		19,684		17,981		9,957		3,115
	Earnings per share attributable to common shareholders
	Basic	$	0.44	$	0.38	$	0.22	$	0.07
	Diluted		0.42		0.37		0.21		0.07